Improvement in gig sawing-machine



tluted 5mm @wat dtjiw.

ALEXANDER THOMPSON ANDv ZERAFWATERS, O

' ILLINOIs.

Letters Patat No. 93,138, daad .my 27, 1869. l

IMPROVEMEN'T IN GIG- SAWING-MACHINE.

*How- The Schedule referred to these Letters 'Patent and makingv part ofthe sama.

The objectof'our invention is to provide an iin-- proved portable footand power gig-saw, ,for the use of carpenters and joiners, and forcutting out all kinds of scroll-work.

Figure 1 is a side elevation of our machine.

Figure 2 is a view of the gearing-apparatus.

vFigure 3 is a view of the sew and its attachments.

Figure 4 is a plan view ofthe arms.

Letter A represents the frame of our machine, which may be formed of anyconvenient size or shape.

Pivoted to the lower part of this frame, is the treadle B, which isconnected to the crank-shaft, upon which the' balance-wheel C revolves,by `a s'hortarm.

-Cas't or secured to the side of this wheel, there is a 'driving-pulley,D, around which -the belt E passes, 4and then over the second pulley F,upon the shaft G. The pulley F slides loosely upon the shaft, and' has'a slot cut in its sides, upon the top and bottom ofthe opeuingin itscentre, so as to receive the two small projections upon the shaft.

To one side of the pulley, there is a-ange attached, in which there is aslot cut, so as to catch the end of the lever H, for the purpose ofthrowing the pulley in and out of gear.

Upon the outer end of'4 this shaft, there is a, small pulley, to whichthe motive-power can also be applied, while upon the other one there isa flat disk, I, which has a small eccentric-pin projecting from itsside.

Attached to a hanging part of the flame, on its side, there is a slottedbar, K, which operates the saw.

This bar has three slots cut into it, two of which run perpendicularly,andA merely serve as guides, as it works up and down upon the box,fastened by bolts or screws, which hold it, while the third runs atright angles with the other two, and is the one in which the eccentricplays, so as to work the bar up and down. v

Secured to the top of the bar, is the saw-blade L,

which passes into aslot made for that purpose, and A then is held therebythe spring M, the lower end of which is secured to the bar K.

It has been customary, heretofore, t?) fasten the saw by means of bolts,or some such tro blesome device, which always requires time and patienceto undo; but by thus securing it with a spring, it is held just asfirmly, and is easily and readily removed and replaced. The upper end ofthis saw lis secured to the block N, which works in the head O.

Upon the top of this framev A, there are secured two long arms P, whichbranch out at their outerends, so as to allow the timber being sawed topass through, while the other two ends approach close together, so as toserve as a support to the head O.

In order to give the saw more or less rake, this head can be movedeither further forward or back, by moving the screw which passes throughthe two arms.

By forming the arms in this manner, we do away v`'with all thestationary rigging from the ceiling generally used for this purpose.

When it is desired to give the saweither a longer or shorter cut, thecrankpin in the disk I can be moved nearer to or further from the centreof motion, there being holes made in the disk for that purpose.

Having thus described our invention,

What we claim, and desire to secure by Letters Patent is v 'hearrangement of the arms P, head O, block N, spring M, bar K, disk I,pulley F, and lever H, when all are cmbined ,in the manner and for thepurpose specified.

In testimony that we claim the foregoing, we ,have hereunto Aset ourhands, this 9th day ot' April, 1869.

ALEXANDER THOMPSON. ZERA WATERS. Witnesses:

R. L. DAVIS, A. O. SwEnTsER.

FI BLOOMuvGTON,A

